As for wow theres actually alot of different things to do at end game.
Pvp like people have said
Heroics raid finder are all quick and easy.
Pet battles which are kinda like pokemon.
Fishing and Archaeology which are both pretty relaxing for me atleast.
You dont need to put all your time into the game. but with that being said i also wouldnt toss ffxiv out of games to play. id give that one a shot too. its alot of fun.
Anyone play on Kel'Thuzad?